fix computed property methods can call super methods (#2274)

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This Pull Request fixes: https://github.com/tc39/test262/blob/79e3bc5176b6f29a5aed3b7164a9c623a3a9a63b/test/language/computed-property-names/object/method/super.js

This PR solves the bug of using the `super` keyword in the method attribute of object. When the environment is `None`, the `vm` gets the top element  of `vm.stack` as `this`, such as:
```js
var a = {
    f() {
        return super.m();
    }
};

var b = {
    m() {
        retrun "super";
    }
};

Object.setPrototypeOf(a, b);

a.f(); // the top of stack is `a`
let f = a.f;
f(); // the top of stack is `global_this`, so `super` cannot be used
```

### Can be improved

What I think is that when I use `object.method()`, the engine should bind `this_object`  to the `environment`, instead of using `vm.stack.last()...`.

### TODOS
1. `super` need to look for properties all the way to the end.

Co-authored-by: creampnx_x <[email protected]>

boa_engine/src/vm/mod.rs

@@ -1521,7 +1521,17 @@ impl Context {
                     let function = function_object
                         .as_function()
                         .expect("must be function object");
-                    function.get_home_object().cloned()
+                    let mut home_object = function.get_home_object().cloned();
+
+                    if home_object.is_none() {
+                        home_object = env
+                            .get_this_binding()
+                            .expect("can not get `this` object")
+                            .as_object()
+                            .cloned();
+                    }
+
+                    home_object
                 } else {
                     return self.throw_range_error("Must call super constructor in derived class before accessing 'this' or returning from derived constructor");
                 };

boa_engine/src/vm/tests.rs

@@ -137,3 +137,48 @@ fn finally_block_binding_env() {
         Ok(JsValue::from("Hey hey people"))
     );
 }
+
+#[test]
+fn run_super_method_in_object() {
+    let source = r#"
+        let proto = {
+            m() { return "super"; }
+        };
+        let obj = {
+            v() { return super.m(); }
+        };
+        Object.setPrototypeOf(obj, proto);
+        obj.v();
+    "#;
+
+    assert_eq!(
+        Context::default().eval(source.as_bytes()),
+        Ok(JsValue::from("super"))
+    )
+}
+
+#[test]
+fn get_reference_by_super() {
+    let source = r#"
+        var fromA, fromB;
+        var A = { fromA: 'a', fromB: 'a' };
+        var B = { fromB: 'b' };
+        Object.setPrototypeOf(B, A);
+        var obj = {
+            fromA: 'c',
+            fromB: 'c',
+            method() {
+                fromA = (() => { return super.fromA; })();
+                fromB = (() => { return super.fromB; })();
+            }
+        };
+        Object.setPrototypeOf(obj, B);
+        obj.method();
+        fromA + fromB
+    "#;
+
+    assert_eq!(
+        Context::default().eval(source.as_bytes()),
+        Ok(JsValue::from("ab"))
+    )
+}